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Finding the Fourth Proportional to 156.22, 215.51 and 102.98

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Solution

The fourth proportional to 156.22, 215.51 and 102.98 is: 142.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.22 : 215.51 = 102.98 : x
  2. Step 2: Convert to fraction form
    156.22/215.51 = 102.98/x
  3. Step 3: Cross multiply
    156.22x = 215.51 × 102.98
  4. Step 4: Simplify right side
    156.22x = 22,192.71
  5. Step 5: Solve for x
    x = 22,192.71/156.22
  6. Step 6: Final answer
    x = 142.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.